[vfio-users] Emulated VGA and real card running in parallel

Blank Field ihatethisfield at gmail.com
Wed Sep 16 23:08:35 UTC 2015


Of course we must purge VGA to avoid arbitration issues.
But it still disables the device. I can't remember exactly what does the
windows say about it or if you can enable it back later, will test tomorrow.
On Sep 17, 2015 2:05 AM, "Blank Field" <ihatethisfield at gmail.com> wrote:

> Ahh, i can't give you an exact link, but at the 2014 KVM forum talk you've
> mentioned something called secondary pass through. What is it then?
> On Sep 17, 2015 1:59 AM, "Blank Field" <ihatethisfield at gmail.com> wrote:
>
>> Win10 does the same thing as 7 or 8 when no driver for qxl is installed.
>> It disables the emulated card.
>> On Sep 17, 2015 1:57 AM, "Alex Williamson" <alex.l.williamson at gmail.com>
>> wrote:
>>
>>> On Wed, Sep 16, 2015 at 4:43 PM, Blank Field <ihatethisfield at gmail.com>
>>> wrote:
>>>
>>>> Cool, your setup is very similar to mine.
>>>> Except i've tried attaching three identical cards to one vm.
>>>> But what about the mouse?
>>>> My mouse input tend to freeze in weird games like minecraft, but i work
>>>> around this by adding a second USB emulated mouse.
>>>> Also, aw, if the emulated GPU turns itself offline in presence of a
>>>> real one, how can we do secondary pass through?
>>>>
>>>
>>> Huh?
>>>
>>>
>>>> The kind of GPU assignment where we have a QEMU window with accelerated
>>>> graphics in it.
>>>>
>>>
>>> Run something newer than Win7.  Even then I don't really consider it
>>> viable because you lose the majority of the performance of having an
>>> assigned GPU by having it render into the emulated graphics framebuffer.
>>>
>>
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